[adius]

Mathics (https://mathics.org/) has been working on a Mathematica clone for years and hasn't had any problems so far. There have been many legal cases establishing that APIs are't copyrightable, and since Woxi shares zero code with Mathematica, it should be fine.

No support for intermediate steps yet, but if there is interest in it, I'd be happy to prioritize it.

[srean]

All the best for your endeavour. It's a big one you are tackling.